Selected Quarterly Information (Unaudited) (Notes)

12 Months Ended

Dec. 31, 2016

Selected Quarterly Information (Unaudited) [Abstract]

Quarterly Financial Information [Text Block]

SELECTED QUARTERLY INFORMATION (UNAUDITED)

	Year Ended December 31, 2016
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Operating results:
Interest income	$	25,089		$	22,816		$	21,135		$	22,858
Interest expense	6,310			6,100			6,068			6,753
Net interest income	18,779			16,716			15,067			16,105
(Loss) gain on derivatives instruments, net	(48,264		)	(16,297		)	2,409			56,546
Loss on sale of investments, net	(3,941		)	(297		)	—			—
Fair value adjustments and other income (expense) amounts, net	87			318			579			(1		)
General and administrative expenses	(4,092		)	(3,671		)	(3,355		)	(3,589		)
Preferred stock dividends	(2,294		)	(2,294		)	(2,294		)	(2,303		)
Net (loss) income to common shareholders	(39,725		)	(5,525		)	12,406			66,758
Other comprehensive income (loss)	41,728			22,947			670			(85,186		)
Comprehensive income (loss) to common shareholders	$	2,003		$	17,422		$	13,076		$	(18,428	)
Net (loss) income per common share	$	(0.81	)	$	(0.11	)	$	0.25		$	1.36
Dividends declared per common share	$	0.21		$	0.21		$	0.21		$	0.21

	Year Ended December 31, 2015
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
Operating results:
Interest income	$	24,099		$	24,527		$	26,096		$	25,522
Interest expense	5,371			5,542			5,859			5,833
Net interest income	18,728			18,985			20,237			19,689
(Loss) gain on derivatives instruments, net	(25,323		)	17,090			(52,749		)	17,854
Gain (loss) on sale of investments, net	1,308			(1,491		)	113			(908		)
Fair value adjustments and other income (expense) amounts, net	72			632			(199		)	174
General and administrative expenses	(4,257		)	(4,754		)	(4,379		)	(4,278		)
Preferred stock dividends	(2,294		)	(2,294		)	(2,294		)	(2,294		)
Net (loss) income to common shareholders	(11,766		)	28,168			(39,271		)	30,237
Other comprehensive income (loss)	23,054			(39,679		)	27,418			(44,877		)
Comprehensive income (loss) to common shareholders	$	11,288		$	(11,511	)	$	(11,853	)	$	(14,640	)
Net (loss) income per common share	$	(0.21	)	$	0.52		$	(0.74	)	$	0.61
Dividends declared per common share	$	0.24		$	0.24		$	0.24		$	0.24